DL3 - Check PFE/DPFE Circuit Continuity

- Key "OFF".

- Pressure Feedback EGR (PFE) / Differential Pressure Feedback EGR (DPFE) sensor disconnected.

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- Measure resistance between PFE/DPFE circuit at the PFE/DPFE sensor vehicle harness connector and test pin 27 at the breakout box.

- Is resistance less than 5.0 ohms?

Yes -- Go to DL4. DL4 - Check PFE/DPFE Circuit For Shorts to Ground and SIG RTN

No -- Service open circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)